Window of metal or similar material in metal wall



May 7, 1935. G. B. JONAS El AL 2,000,845

I WINDOW OF METAL OR SIMILAR MATERIAL IN'METAL WALL Filed Feb. 11, 1951 Patented May 7, 19.35

UNITED STATES 2,000,845 ,7 METAL R SIMILARVMATERIAL WINDOW or PATENT-O FFlCE. I

' IN METAL sGottfried Bruno Jonas and August Therman Es seling, Eindhoven, Netherlands, assignorsto N. V. Philips Gloeil .hoven, Netherlands ampenfabrieken, Eind- Application February 11, 1931, Serial No. 515,118 In the Netherlands March 25, 1930 sciaims. (01. 250-35) I This invention relates to a window made of metal or similar material provided in ametal wall. Such windows are used in'some discharge tubes, in which they serve for the passage of rays, for example, X-rays or cathode rays. 1

The provision of such windows which require as a rule an hermetic joint, is not always easy and especially when using very thin windows having, for example, a thickness of some hun-.

dredths of a millimeter, it'is attended with difii culties.

The'present invention has for its purpose to avoid these diiiiculties and concerns a metal or similar window in a metal wall, which window is fixedby fusing a binding agent consisting of a vitreous material which preferably surrounds the rim of the window. 1

A particularly durable arrangement is obtained if the window is provided in a recess or groove of the metal wallgwhichgroove is en-. the vitreous binding tirely or partly filled with agent. I

There may also be provided a metal ring or locking-piece covering the rimof the window, a layer of the vitreous binding agent being interposed between such ring or locking-piece and the window. The, provisionof such a locking piece renders the joint more rigid and afiords a certain protection at the same time.

By the invention it is rendered possible to use very thin windows which are extremely diificult if not impossible to secure in positionin another way,for example, by soldering.

The material of which these windows are made may be capable per se of being'fixed to the metal of the wall. If, however, the thickness of the windows is extremely small, sealing the window by fusing or welding its edge to the metal wall damages the window on, account of the heat employed. This difllculty is avoided-by thepresent invention and the risk of overheating the window may be further minimized by keeping the window in contact with a protective body, for example of graphite, during the mounting process whereby the temperature of the window isprevented from rising'unduly.

sion. An excellent joint may be obtained, for ex-,

ample, if the metal wall and the locking piece consists of a chrome iron alloy.

The bindingagent may also consist of or similar mixtures.,

The invention will be more clearly understood by reference to'the' accompanying drawing representing, by way of example, one embodiment thereof.

enamel A- metal portion l constituting, for example, the wall or" a discharge tube for -X-rays or cathode rays, is provided with an aperture 2 which is shut off by a thin window 3 consistingior example, of.

a millimeter. The rim of this window engages arecess 4 in the wall and is hermetically connected to'the metal portion. i by means of a quantity of glass? which is fuse-:1 between the wall-of the window and the metal portion I. The recess 4 7 serves at the same time to-receivean annular locking piece 6, which is covered with glass and glass is fused by heating, so-that it melts together so astoform a compact-intermediate substance. If this heating is eiiected in a flame, it is advisable laid on the rim of the window3 whereupon the to cover the window with a heat insulating body for example of graphite thus preventing the window from being uniavourably ailected by the heating. g

What-we claim is: L 1. A metal wallhaving an aperture, the wall at the edge of said aperture having'a peripheral recess, athin non-vitreous disc extending into said recess so as. to form a window, a fused vitreous;

binding agent enclosing the peripheral edge of said none'vitreous window, and a metal ringin the recess, said binding agent adhering to the bottom and side walls of said recess and to the metal ring.

2. A metal wall having an aperture, the wall at the edge of said aperture having aperipheral recess, a metallic window closing said aperture, a

metal ring overlying the edge of said window, and A to the walls of said re '1 a vitreous binding agent enclosing theedge of said window. and adhering cess and to the metal ring.

3. Ari electric discharge tube for'emitting rays having a metal wall portion showing an aperture; a non-vitreous'window overlying said aperture of said wall portion and permitting the passage of the rays, the wall at the edge of said aperture being formed with a recess, a metal piece disposed insaid recess and spaced from the walls thereof,

and vitreous binding materialffused to the w alls' of the recess and the metal piece and surrounding a the peripheral edge of said window, the window being disposed between said metal piece and the bottomfof said recess.

GOTTFRIED BRUN'O JoNAs.

AUGUST THERMAN ESSELING. i

101. nickel having a thickness of some hundredths of I CERTEFICATE or CORRECTEON.

Patent No. 2,000,845. May 7, i935.

GOTTFRiEfi BRUNO JONAS, ET AL.

It is hereby certified that error apsears in the printed specification of the above numbered patent requiring correction as ioilows;

Page 1, second column, line 33, claim 1, strike out the word "non-vitreous"; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 11th day of June, A. D. 1935.

' Leslie Frazer (Seal) Acting Commissioner of Patents. 

